I just had this motor rebuilt and had to go 10 over on the bore; so I put in forged flat-top pistons. I also put in slightly larger valves and a larger cam but I didn't go too crazy because I knew that the intake couldn't handle it. One thing I did find on the web (at www.twoguysgarage.com
) was a group of links where you could buy all of the stuff to convert the Crossfire to the later model C4 multiport fuel injection system. Apparently Two Guys Garage is a tv show and they did this conversion on the program. I'm still following up. thanks.